According to Revelation 16:8-9, the inhabitants of the earth will experience extreme scorching heat in the last days before Jesus returns to the earth:

“Then the fourth angel poured out his bowl on the sun, and it was permitted to scorch people with fire. Thus people were scorched by the terrible heat, yet they blasphemed the name of God, who has ruling authority over these plagues, and they would not repent and give him glory.”